Ah, one of my favorite synth pads ever. It sets the backdrop of the song perfectly.
The main synths she was using when this was recorded were a D-50, Juno 60, PPG Wave and Kurzweil K250.
Any PPG or D50 owners familiar with this kind of sound? Sounds to me like a Wave with a generous amount of reverb. I don't think it would be coming from the Juno or the K250.